Recently, we discovered and isolated carolacton (1) from the extracts of Sorangium cellulosum strain So ce96.[1] Subsequent screening revealed unique biological properties of carolacton (1): it drastically reduces the number of viable cells in biofilms at nanomolar concentration.[2] In particular, biofilms containing the caries-and endocarditis-associated bacterium Streptococcus mutans were sensitive to a solution of 1 at a concentration of ...